<template>
  <el-table :data="formatData" :row-style="showRow" v-bind="$attrs" @selection-change="handleSelectionChange">
    <el-table-column
      v-if=""
      type="selection"
      show-overflow-tooltip
      width="55"
    />

    <el-table-column v-if="columns.length===0" width="100" label="id" align="center">
      <template slot-scope="scope">
        <span v-if="typeFilter(scope.row.type)">{{ scope.row.id }}</span>
      </template>
    </el-table-column>

    <el-table-column v-if="columns.length===0" width="100" label="-" align="center">
      <template slot-scope="scope">
        <img
          v-if="scope.row.type === 'product' && scope.row.main"
          class="img-thumbnail"
          :src="scope.row.main"
          @click="handleViewImage(scope.row.main)"
        >
        <span v-else-if="scope.row.type === 'supplier'">{{ scope.row.catalog__count }}</span>
        <span v-else-if="scope.row.type === 'image'" title="Main Image"><svg-icon
          v-if="scope.row.main"
          icon-class="main"
          style="margin:0 8px"
        /></span>
      </template>
    </el-table-column>

    <el-table-column v-if="columns.length===0">
      <template slot-scope="scope">
        <span v-for="space in scope.row._level" :key="space" class="ms-tree-space" />
        <span v-if="iconShow(0,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
          <i v-if="!scope.row._expanded" class="el-icon-plus" />
          <i v-else class="el-icon-minus" />
        </span>
        <svg-icon :icon-class="scope.row.type" style="margin:0 8px" />
        {{ scope.row.name || scope.row.title }}
      </template>
    </el-table-column>
    <el-table-column
      v-for="(column, index) in columns"
      v-else
      :key="column.value"
      :label="column.text"
      :width="column.width"
    >
      <template slot-scope="scope">
        <span v-for="space in scope.row._level" v-if="index === 0" :key="space" class="ms-tree-space" />
        <span v-if="iconShow(index,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
          <i v-if="!scope.row._expanded" class="el-icon-plus" />
          <i v-else class="el-icon-minus" />
        </span>
        {{ scope.row[column.value] }}
      </template>
    </el-table-column>
    <slot />
  </el-table>
</template>

<script>
/**
   Auth: Lei.j1ang
   Created: 2018/1/19-13:59
   */
import treeToArray from './eval'

const show_id_type = ['supplier', 'product']
export default {
  name: 'TreeTable',
  props: {
    data: {
      type: [Array, Object],
      required: true
    },
    columns: {
      type: Array,
      default: () => []
    },
    evalFunc: Function,
    evalArgs: Array,
    expandAll: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    // 格式化数据源
    formatData: function() {
      let tmp
      if (!Array.isArray(this.data)) {
        tmp = [this.data]
      } else {
        tmp = this.data
      }
      const func = this.evalFunc || treeToArray
      const args = this.evalArgs ? Array.concat([tmp, this.expandAll], this.evalArgs) : [tmp, this.expandAll]
      return func.apply(null, args)
    }
  },
  methods: {
    showRow: function(row) {
      const show = (row.row.parent ? (row.row.parent._expanded && row.row.parent._show) : true)
      row.row._show = show
      return show ? 'animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;' : 'display:none;'
    },
    // 切换下级是否展开
    toggleExpanded: function(trIndex) {
      const record = this.formatData[trIndex]
      record._expanded = !record._expanded
    },
    // 图标显示
    iconShow(index, record) {
      return (index === 0 && record.children && record.children.length > 0)
    },
    typeFilter(type) {
      return show_id_type.includes(type)
    },
    handleViewImage(v) {
      window.open(v)
    },
    handleSelectionChange(v) {
      this.$emit('handleSelectionChange', v.filter(m => m.type === 'product'))
    }
  }
}
</script>
<style rel="stylesheet/css">
  @keyframes treeTableShow {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

  @-webkit-keyframes treeTableShow {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
</style>

<style lang="scss" rel="stylesheet/scss" scoped>
  $color-blue: #2196F3;
  $space-width: 15px;
  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: $space-width;
    height: 14px;
    &::before {
      content: ""
    }
  }

  .processContainer {
    width: 100%;
    height: 100%;
  }

  table td {
    line-height: 26px;
  }

  .tree-ctrl {
    position: relative;
    cursor: pointer;
    color: $color-blue;
    margin-left: -$space-width;
  }

  .img-thumbnail {
    border-color: #ccc !important;

    padding: 4px;
    line-height: 1.42857;
    border-radius: 3px;
    -webkit-transition: all 0.2s ease-in-out;
    -o-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
    display: inline-block;

    width: 90px
  }
</style>
